gnu: Add r-devtools. * gnu/packages/statistics.scm (r-devtools): New variable.
gnu: Add r-rstudioapi. * gnu/packages/statistics.scm (r-rstudioapi): New variable.
gnu: Add r-git2r. * gnu/packages/statistics.scm (r-git2r): New variable.
gnu: Add r-httr. * gnu/packages/statistics.scm (r-httr): New variable.
gnu: Add r-roxygen2. * gnu/packages/statistics.scm (r-roxygen2): New variable.
gnu: Add r-brew. * gnu/packages/statistics.scm (r-brew): New variable.
gnu: Add r-whisker. * gnu/packages/statistics.scm (r-whisker): New variable.
gnu: Add r-rversions. * gnu/packages/statistics.scm (r-rversions): New variable.
gnu: Add r-xml2. * gnu/packages/statistics.scm (r-xml2): New variable.
Merge branch 'master' into dbus-update
gnu: Add python-statsmodels. * gnu/packages/statistics.scm (python-statsmodels, python2-statsmodels): New variables.
gnu: Add python-patsy. * gnu/packages/statistics.scm (python-patsy, python2-patsy): New variables.
gnu: Add r-data.table. * gnu/packages/statistics.scm (r-data.table): New variable.
gnu: Add r-chron. * gnu/packages/statistics.scm (r-chron): New variable.
Merge branch 'master' into core-updates
gnu: r-scales: Update to 0.3.0. * gnu/packages/statistics.scm (r-scales): Update to 0.3.0.
gnu: r-scales: Update to 0.3.0. * gnu/packages/statistics.scm (r-scales): Update to 0.3.0.
gnu: Add r-dplyr. * gnu/packages/statistics.scm (r-dplyr): New variable.
gnu: Add r-r6. * gnu/packages/statistics.scm (r-r6): New variable.
gnu: Add r-testthat. * gnu/packages/statistics.scm (r-testthat): New variable.